Method of making electrodes for secondary batterleo



'No Model.)

W. WALLACE.

METHOD OF MAKING ELECTRODES FOR SECONDARY BATTERIES. No. 278,638. Patented May 29,1883.

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,INVENTOR ,Z4,LMW

ATTORNEY f titres PATENT Carton.

WELLIAM 'WALLACE, OF ANSONIA,CONNECT1CUT, ASSIGNOR Ol TWO- THIRDS TO ASAHEL K. EATON, OF BROOKLYN, NEW YORK, AND THOMAS WALLACE, OE ANSONIA, CONNECTICUT.

METHOD OF MAKlNG ELECTRODES FOR SECONDARY BATTERiEo SPECIFICATION forming part of Letters Patent No. 278,638, dated May 2:, 1883,

Application filed October 52, 1852;

of Connecticnnhave invented a certain new and useful Method of Making Electrodes for Secondary Batteries, of which the following is a description in such i'ull, olear,concise, and

exact terms as to enable any one skilled in the arts to which my invention belongs or with which it is most nearly connected to'miakeand' use the same, reference beinghad to the accompanying drawings, making part of this specification, and the letters and ligures oi refer ence marked thereon.

My invention is confined to an improved method of making elect-rodeplates, and in the drawings onlyone .ot' the plates is shown, that being sufficient to. tally illustrate the inveir tion. I

ByFignre l of said drawings is shown alongitudinal section through an electrodeplate made upon the plan of my invention, the section being upon the line A A of Fig. 2. By Fig. 2 of said drawings is shown a transverse section through said electrode-plate on the line BB of Fig. 1. Fig. 3 is a detail view.

My in ection consists of the following method of making the electrode-plate:

Let A be a thin sheet of perforated lead. Let c c be a series of short pins, or" equal lengths, set in said lead plate -in the manner shown. Letb Ze represent a thin ribbon or strip of sheetlead of the width, say, represented by H, and let this ribbon be stretched over the pins 0, thus forming a coil of the ribbon over the surface of the plate to the extent desired. Now insert between the coils of the lead ribbon thin strips of zinc plate a, about equal in width to the lead ribbon. Then let a second perforated lead plate be made precisely like the plate A, omitting the pins, and let it be placed upon the plate A over the coil of lead ribbon and zinc slips, the two lead plates being, dished, as in Fig.2, so as to bring their surfaces together at the edges, and the edges of one plate heinglapped over the edge of the other, so as to form a scam uniting the two plates at their edges on all sides. The plate, being thus made, is laid in a dish and covered with a saturated solu- (No model.)

tion of acetate of lead, the action of which upon the zinc slips and lead ribbon between the plates produces a thick layer oi spongelead.

In the construction of this electrodcplale,

Zinc filings may be substituted for the strips of zinc, and the pins may be omitted in coiling the lead ribbon, and perhaps the better way to make it is to coil the ribbon first and lay it; on the plate, and open the coils to the desired widths; and it is not essential that the inclosing-platcs A be of lead vor metal of any kind. 'lhin asbestos board or its equivalent may be substituted for the lead plates, and, instead'of seaming the edges of the plates, they may be united or fastened in any other suitable manner The only novelty there is in this electrodeplate is in the method ot making it, and the advantage of making the plate in this way will be apparent, for by cutting the lead in strips and laying it upon its edge and putting strips of zinc between it in the same way a layer of lead sponge can be obtained in thickness about equal to the width oi'the ribhon of lead, whereas it the sponge-lead be formed upon a simple sheet of perforated lead between zinc plates the layer will not he so thick as by the plan above described.

it will of course be understood that the acetate of lead can be applied to the lead ribbon and zinc before the top plate is puton; but that method is included in the plan oitbe invention.

What I claim, therefore, and desire to secure by Letters Patent, is-

lho method substantially herein described of making the electrode-plates, which method consists of making a coil of lead ribbon or its equivalent, and of inclosing it upon its edges between suitable side plates, and interposing between its'folds or coils slips or pieces of zinc, and treating the same with acetate of lead to form the sponge-lead, substantially as described.

WILLIAM WALLACE.

Witnesses:

F. L. GAYLORD, Geo. E. HAWLEY. 

